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CAZ223.
Your position closely mirrors what I have have been saying about stretching/trimming of revolver vs pistol brass.
There is, however, one little caveat to your reasoning with the non/stretching pistol brass. When the pistol case obturates against the walls of the chamber, it probably gets a little shorter, if there's any change in the case length at all. The potential for the growth of length of the case comes not from the firing process but the resizing process. Remember that the outside diameter of the case, after firing, is now larger than it was before firing. (That's why you size it, but you know that) When you resize the case back down to or just under new case dimensions, where does or can that extra material go??
The bottom line is this: If the length of your cases (pistol or revolver) causes problems for you, or if you just like to trim your cases, by all means, trim 'em.
If neither of those conditions exist for your application, why bother?
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